Like others, I had frustratingly bad performance in Divine Divinity. Framerates would dip down to 21-22 FPS and the game would stutter. I was changing the options in the Settings app (separate executable, not in-game menus) and was having no luck. I tried forcing DD to use the discreet GPU in my laptop (AMD 6800M), no improvement. Save/load times started around 10 seconds with the game installed on a PCIe Gen 3 NVMe drive, and the more I tried to improve performance, the worse it got. At one point saves/loads were taking around 30 seconds.
As a last resort I tried "Software" instead of "Direct3D" rendering. BEAUTIFUL! It's counterintuitive, as most games from the era ran much faster with 3D acceleration, but software rendering keeps the framerate above 70 FPS and loses no graphical quality. Save/load time dropped to 2-3 seconds!
On a laptop with a 15", 1080P screen, I initially had trouble finding things like keys and snakes onscreen. Dropping the resolution to 720P helped, and once I got used to the game I was able to go back to 1080P. Using a bow and sight buffs lets your character get the jump on enemies, and the higher resolution lets the player see further out. Not a cheat, since it uses only options and gear provided by the game, but a definite advantage over the old 640x480 or 800x600 view.
The basic mechanics are obviously lifted from Diablo, which is not a bad start. As another reviewer noted, Divine Divinity really is an open-world RPG. Once you leave Aleroth you can go anywhere, provided you can survive the trip. Added character progression options also help lift DD above "Diablo clone" status. Teleportation keeps the game from becoming a repetitive slog through the same areas.
The art style and isometric view make Divine Divinity easier to get into in the 2020s than the relatively primitive 3D games from the same time. Combat may be "ARPG" hack'n'slash, but this is a full-on RPG that's still worth the time.